Single point based techniques for rapid and robust gradient measurement

Hyungseok Jang1,2 and Alan B McMillan1

1Department of Radiology, University of Wisconsin, Madison, WI, United States, 2Department of Electrical and Computer Engineering, University of Wisconsin, Madison, WI, United States

Accurate knowledge of the k-space trajectory is critical for artifact-free
MR imaging, particularly in non-Cartesian imaging. In this study we propose a new gradient measurement
technique based on single point imaging (SPI), which allows simple, rapid, and
robust measurement of k-space trajectory. In the proposed technique, the zoom-in/out
effect of SPI is used for k-space trajectory measurement. First, 1D SPI data
are acquired from a targeted gradient in each axis, and then relative FOV scaling
factors between encoding times are found, which represents relative k-space
position. Improvements in image quality are demonstrated for UTE, spiral, and ramp-sampled
IDEAL imaging.

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